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以民勤连古城自然保护区不同生境条件下的沙木蓼群落为研究对象,分别测定各样方物种组成、沙木蓼生长特征、优势种重要值、物种多样性指数,分析各指标之间的关系。结果表明,沙木蓼群落物种稀少,组成简单,以旱生、超旱生灌木和多年生草本占主导地位,表现出明显的荒漠草原植被特征。沙木蓼群落以旱生灌木层为优势层片,多年生草本层数量次之,1年生草本数量最少,群落稳定性主要由灌木层和多年生草本层决定。群落所处生境决定了群落重要值、生长量指标以及多样性指数。生境类型Ⅲ中沙木蓼生长量最大,表明该生境是适宜沙木蓼生长的生境类型,而生境Ⅱ中的群落多样性指数、均匀度指数为最高,群落优势度较低,表明该生境是适宜群落中大部分植物生长的生境类型。生境类型Ⅰ和生境类型Ⅲ相似,在群落特征上也表现出一定的相似性。
The community structure of Polygonum viviparum in different habitats of Minqin Lianqiu Nature Reserve was studied. The species composition, the growth characteristics, the important value of dominant species and the species diversity index of each species were determined. Relationship. The results showed that the species of Polygonum viviparum communities were rare and the composition was simple. The dominant species were xerophytes, super-shelled shrubs and perennial herbs, which showed obvious characteristics of desert steppe vegetation. Polygonum viviparum community was dominated by xerophytic shrub layer, followed by perennial herb layer, with the least amount of annual herbaceous community. The community stability was mainly determined by shrub layer and perennial herb layer. The community habitat determines the community importance, growth indicators and diversity index. Habitat type III Polygonum viviparum maximum growth, indicating that the habitat is suitable for Polygonum species growth Habitat type, and Habitat II community diversity index, evenness index highest, community dominance is low, indicating that the habitat is Habitat types suitable for the majority of plant growth in the community. Habitat type I is similar to habitat type III, and shows similarities in community characteristics.